"Vanessa and I are all drunk and coked out in the movie," Benson (looking fab in Balenciaga and Monique Lhuillier) told me on the pink carpet at the Teen Choice Awards. "Selena is just drunk, not coked out."

Don't worry that Selena's gone over the edge. The trio play party-hearty coeds in the upcoming indie flick Spring Breakers. And they used crushed vitamin B12 for the lines of cocaine they snorted in the movie.

Playing liquored up proved to be a lot of fun.

"It's awesome," the Pretty Little Liars beauty said. "We sing a lot of Britney Spears when we're drinking in the movie. We do a lot of crazy stuff."

—Additional reporting by Brandi Chang

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